US3449792A - Blow molding apparatus - Google Patents

Blow molding apparatus Download PDF

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Publication number
US3449792A
US3449792A US577682A US3449792DA US3449792A US 3449792 A US3449792 A US 3449792A US 577682 A US577682 A US 577682A US 3449792D A US3449792D A US 3449792DA US 3449792 A US3449792 A US 3449792A
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Prior art keywords
mould
parison
moulding
blow
tubing
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Expired - Lifetime
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US577682A
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English (en)
Inventor
Henry J Plummer
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Marrick Manufacturing Co Ltd
Evonik Corp
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Marrick Manufacturing Co Ltd
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Assigned to NUODEX INC., A CORP OF DE. reassignment NUODEX INC., A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TENNECO CHEMICALS, INC.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42101—Conveyors, e.g. flat conveyor or clamping between two bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • B29C49/28008—Blow-moulding apparatus mounting, exchanging or centering machine parts, e.g. modular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4247—Means for deforming the parison prior to the blowing operation using spreading or extending means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/08—Preforms made of several individual parts, e.g. by welding or gluing parts together
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42051—Means for stripping, aligning or de-stacking
    • B29C49/42055—De-stacking preforms, e.g. delivered in a stacked configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42105—Transporting apparatus, e.g. slides, wheels or conveyors for discontinuous or batch transport
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular

Definitions

  • the mandrel-supported tubing lengths are heated in an oven to molding temperature, at which they are received at a molding station provided with means for introducing fluid under pressure into each tubing length to expand the same into conformity with mold means to form a molded article.
  • a guide track supports slides which support the mandrels for movement therealong, and the track extends from the oven to and through the molding station, thence to and through an unloading station, where the molded article is removed from the mandrel, and thereafter to and through the loading station to the oven.
  • a drive conveyor extends within the oven and has transverse guides for receiving the slides.
  • the drive conveyor is advanced intermittently and, when it is at rest, at least one of the slides is discharged from the conveyor into the track and advanced in the track.
  • the operations at all stations are coordinated with the slide movement, and before the mold is completely closed, the unsupported end of the tubing length is centered in the mold.
  • This invention relates to the production of articles by a technique known as blow-moulding and ⁇ in which a straight tube is enclosed in a mould and is expanded therein by injecting lluid under pressure into the tube.
  • the outside wall of the tube is expanded into conformity with the interior surface of the mould and thus has imparted to it the surface nish of the mould.
  • This technique is known as blow-moulding and is used successfully to produce thin-walled hollow articles, such as bottles, from thermoplastics material.
  • the tube sections 3,449,792 Patented June 17, 1969 ICC are sufficiently soft to be expanded by uid under pressure injected into them but are rigid enough to support their own weight without bending provided that stresses are not frozen into them during extrusion. If such stresses are present they tend to relieve themselves in the oven and cause the tube sections to warp or bow.
  • the tube sections When the tube sections reach moulding temperature they are carried by the mandrels from the oven to a moulding station. Here the hot tube sections or parisons are trapped inside a mould formed by two half-moulds which come together around the parison and pinch its top and while simultaneously forming a seal around the outside surface of its bottom end.
  • the mandrel When the mandrel is at the moulding station an opening in its underside registers with a nozzle through which lluid under pressure, commonly air, is injected into the parison to expand it in the cavity of the mould.
  • Apparatus operating as described above can produce blow-moulded articles such as bottles relatively rapidly. However, there is inevitably some wastage due to imperfect blowing or puncturing of the parison during blowing and reject articles are sorted from the acceptable articles at the stripping station.
  • the wall thickness of the extruded tubing to be used in the blow-moulding process is as thin as possible.
  • the thinner the wall of the tubing the less the weight and volume of plastics material in the nished article and the lower will be its nal cost.
  • the time spent by the tube sections in the oven and the time and pressure necessary to expand them in the moulds are both reduced with decreasing wall thickness.
  • certain difficulties are experienced when the wall thickness of the tubing is reduced which result in an increasing reject rate of blowmoulded articles and a consequent decrease in eiciency of the process.
  • Variations in tube wallthickness result in uneven expansion of the parison when being blown and increased likelihood of blow-outs occurring during expansion of the portion of the parison wall of reduced thickness.
  • the presence of stresses frozen into the extruded tubing results in the tube sections bowing or warping when they pass through the oven with the result that banana-shaped parisons emerge from the oven.
  • Such banana parisons cannot be successfully blow-moulded because although the bottom end of the parison is centred in the mould when closed, the top end of the parison is offset as a result of the lean of the upper end-portion of the parison induced by the warp.
  • the base of the article which is normally formed at the top of the mould and which requires to be strong, is either ruptured or excessively weak in one region corresponding to that part of the top end of the parison required to expand most as a result of the offset positioning of the top end of the warped parison when the two halves of the mould closed on it.
  • a blow-moulding station for expanding parisons of plastics material into conformity with a mould cavity defining the shape of an article to be produced, is provided with means which centre both ends of a warped parison in the mould as the mould closes on it prior to blow-moulding.
  • the advantage of the invention 4 is that the maximum misalignment between the axis of the parison and the axis of the mould occurs at the central part of the mould rather than at the ends.
  • blow-moulded articles require more structural strength at the ends than at the middle it is possible, by using the invention, to blow-mould curving tube sections, such as banana parisons, to produce acceptable articles.
  • blow-mould curving tube sections such as banana parisons
  • a further advantage of the invention is that for any given banana parison the maximum misalignment between the axis of the mould and the axis of the parison is reduced by half when such mis-alignment occurs in the central part of the mold.
  • the maximum radial expansion of any part of the parison wall is reduced and therefore a thinner wall thickness of tubing to form the parison can be used successfully.
  • a thinner wall thickness of the parison for producing blow moulded articles of the same physical strength represents a saving in weight and cost and also an increased production speed as the residence time of the parisons in the oven and the moulds is reduced.
  • the centering means comprises an expanding device in axial 'alignment with the axis of the mould cavity and which is introduced while in a contracted state into one end of the parison immediately prior to the instant that the two parts of the mould come together.
  • the device may be inserted while in a contracted condition into the top end portion of the parison and expands therein to centre the top end of the parison immediately prior to the mould closing.
  • the device only engages the top end of the parison above the position of the pinch formed as the two parts of the mold close on one another.
  • FIGURE 1 is a schematic plan view of apparatus for producing blow-moulded hollow articles
  • FIGURE 2 is a side view of apparatus for centering the upper ends of parisons in their moulds
  • FIGURE 3 is an end view of the apparatus of FIG- URE 2.
  • FIGURES 4 to 9 show diagrammatically, in stages, the centering of a warped parison in a mould during closure of the mould and subsequent blow moulding of the parison.
  • the blow-moulding apparatus shown in FIGURE 1 is generally constructed in accordance with Patent No. 3,- 149,373, and blow moulds parisons formed by hot cylindrical sections of extruded polyvinyl chloride tubing which is relatively free of frozen-in stresses.
  • the tube sections are approximately 131/2 inches long and have an outside diameter of 11/2 inches and a wall thickness of l/ inch.
  • the cylindical tube sections 1 are stored at a loading station 2 and are lowered six at a time on respectve upright mandrels 3 each formed by a thin wire cage projecting upwards from a nozzle 15 mounted in a slider mounted in a slider 4 as shown in FIGURE 4. After loading of the six mandrels 3, the six tube sections are moved as a string into the entrance end of a thermostaticallycontrolled oven 7.
  • the strings of six tube sections are conveyed slowly through the oven on their respective mandrels in a direction perpendicular to the string of sliders, and their temperature is slowly and evenly raised to centigrade which is attained at the exit end of the oven shown on the right of FIGURE 1.
  • polyvinyl chloride is sufficiently hard to be self-supporting yet Ais sufficiently soft to be blow-moulded.
  • any stresses frozen into them are relieved and cause warping, bowing or leaning resulting in the formation of banana parisons. In practice about 10% of the parisons4 are commonly ailected in this way.
  • each of the mandrels 3 is centered between two spaced half-moulds 10, 11 each carried by a bar 12 moveable towards and away from the mandrels by a hydraulically operated ram 13.
  • the slider 4 beneath each of the mandrels is located directly above an outlet 14 (see FIGURE 4) which registers with a passage in a nozzle 15 at the base of the mandrel 3 for injecting air under pressure into the parison during blow-moulding.
  • the two half-moulds 10, 11 When the two half-moulds 10, 11 are pressed together by their respective rams 13 they provide a mould-cavity in the shape of the outside wall of an inverted square cross-section bottle.
  • the axial length of the bottle is approximately one foot and the top ofthe parison is pinched at 21 (see FIGURE 8) between closing surfaces at the top of the mould when the two half-moulds come together so that air does not leak through the top of the parison during moulding.
  • the bottom portion of the parison is lirmly cornpressed in diameter around a neck 23 beneath the nozzle so that no leakage of injected air occurs around the neck of the upturned bottle while being moulded.
  • the six moulds open and close together under the control of the two hydraulic rams 13.
  • the lower end of each parison is automatically centered in the lower end of the mould by the correct positioning of a flange (not shown) on the slider 4 at the base of the mandrel 3 and on which the bottom rim of the parison rests.
  • the top ends of the parisons are also centered, prior to the six moulds finally cl-osing, by means of six centering devices 30 one being associated with each mould as shown in FIGURE 2.
  • the six centering devices 30 are shown in FIGURES 2 and 3 and are mounted on a horizontal bar 31 which is vertically moveable by an hydraulically operated piston unit 32.
  • the piston unit 32 comprises a cylinder xed to a stationary frame 29 and in which is a moveable piston connected by a downwardly directed piston rod 19, which passes through part of the frame, to the centre of the bar 31.
  • Each centering device 30 is of caliper form and comprises two arms formed by respective thin metal plates 33 approximately 31/2 long lying edge to edge in a vertical plane.
  • Each arm or plate is of generally triangular shape and has its upper portionpivoted at 34 to the bar 31 and its lower portion depending beneath the bar and formed with a downwardly directed fingerlike spike 35 having converging at surfaces 28 which taper to a point 36 at its lower end.
  • the two plates are arranged with their hypotenuses touching one another and the points of the two spikes lie on the continuation line of the two hypotenuses.
  • the two plates together, resemble a kite split down the centre and provided with a downwardly pointing tail approximately 1 long provided by the spikes and which tapers over the bottom a/s to the sharp point 36 lying on the division lineof the kite.
  • the two plates are held hypotenuse to hypotenuse by a coil spring 37 extending horizontally beneath the pivots 34 of the plates and anchored at opposite ends to two pins 38 which project from regions of the plates disposed beneath and outwardly of the pivotal positions 34.
  • a semicircular hole 40 is formed in the hypotenuse of each plate approximately 11/2" beneath its upper end.
  • the periphery of the upper end of each plate is angular about its pivotal axis 34, and provides a fiat edge 51 which by engaging the at edge 51 of the other plate limits opening movement of the caliper.
  • a horizontal beam 41 extends alongside the downwardly directed points 36 of the plates on the side opposite to the bar 31 on which the plates are pivoted, as shown in FIGURE 3.
  • the 'beam 41 is rigidly xed to the frame 29 of the moulding apparatus and although it is spaced from the surfaces of the plates 33 it provides an abutment face which obstructs downward movement of the pins 38 on the plates when the bar 31 has been lowered by the piston unit 32 a little more than 1".
  • FIGURES 4 to 9 show stages in the centering of a warped parison in its mould and its subsequent blow moulding.
  • the warped parison is referenced 11, and one half 12 of the mould is shown behind it.
  • the slider 4 is stationary in the centre of the mould so that when an unwarped parison is being blow-moulded it stands at its base on the centre line of the mould.
  • FIGURE 4 shows the mould before closing and with the warped parison 1 having its bottom end centred in the mould and its top end-portion leaning towards the left.
  • FIGURE 5 shows the commencement of final closing movement of the two halves of the mould during which the upper end-portion of the parison starts to get pinched between the closing surfaces at the upper end of the mould.
  • the pinching results in its upper end-portion being distorted from a circular cross-section to an elliptical cross-section, the major axis of the ellipse coinciding with the parting line of the mould.
  • the lean of the parison being in the direction of movement of the closing half moulds, that is to say perpendicular to the plane of the paper in FIGURE 4, the parison will normally twist about the mandrel during mould closing until its upper end leans in the direction of the parting line of the mould.
  • the axis of the centering device 30 coincides with the axis of the moulds beneath and it would therefore be necessary for the top end portion of the banana parison 1l to have its axis displaced relative to the axis of the mould by rather more than half the internal diameter of the parison for the point 36 of the caliper de- Vvice 30 to miss the open end of the parison altogether.
  • banana parison having a displacement at its top end as great as this is most unlikely.
  • FIG- URES 6 and 7 it will be seen that the opening movement of the caliper device corrects any misalignment between the axis of the top end Z7 of the parison and the axis of the mould which is still closing about the parison.
  • the top end of the parison 11 is centred in the mould before closure by the device 30 and the bottom end of the parison 11 is centred in the mould by the mandrel assembly.
  • the opening movement of the caliper device 30 takes place rapidly and is completed before iinal closing of the mould so that the later pinching of the top end portion of the parison between the two parts of the mould as shown at 21 in FIGURES 8 and 9 is not influenced by the open caliper device 30 the points 36 of which are disposed above the two parts of the mould.
  • the centering device 30 is closed and raised by the bar 31 and the mandrel 13 carries the hollow moulded article, so made, to the unloading and stripping section shown at 9 in FIGURE 1.
  • the ⁇ article is checked for faults and superfluous plastics material such as the portion 27 is stripped from it at the pinch 21.
  • the reject rate of mass-produced blow-moulded articles made of polyvinyl chloride on the apparatus described above can be reduced from 20% to 5% Iby the use of the centering devices.
  • the great reduction in waste obtained by using the invention means that for a given apparatus the capacity and therefore the size of the waste handling equipment can be reduced, the production rate of blow moulded articles is increased, and the cost per bottle is reduced substantially. Further the centering of the top end of a warped parison in the mould so that it produces a good base to the bottle enables a thinner parison tube to be used without loss of strength to the bottle where it matters, namely, the base. A consequence of this is that the weight and cost of the bottle is reduced, the oven heating time is reduced, the production rate is increased and the cost of running the apparatus is reduced.
  • Apparatus for blow moulding hollow articles from tubular parisons of thermoplastics material comprising: a plurality of mandrels for supporting individual discrete lengths of thermoplastics tubing, a loading station including means for loading said mandrels with said tubing lengths, an oven for heating mandrel-supported tubing lengths to moulding temperature, a moulding station including mould means adapted to receive at least one of said mandrel-supported tubing lengths at moulding temperature and means ⁇ for introducing iiuid under pressure into said tubing length to expand same into conformity with said mould means to form a moulded article, an unloading station including means for removing said article from said mandrel, slides supporting said mandrels, a guide track supporting said slides for movement therealong and extending from said oven to and through said moulding station, thence to and through said unloading station and thereafter to and through said loading station to said oven.
  • a drive conveyor extending within said oven, said conveyor including transverse guides for receiving said slides for conveyance through said oven in side-by-side spaced-apart relationship, means for intermittently advancingsaid drive conveyor, means operative when said drive conveyor is at rest for discharging at least one of said slides from said drive conveyor into said guide track while advancing said slides in the latter to feed a corresponding number of said slides from said guide track into said drive conveyor, means coordinating the operations at said stations with the movement of said slides in said guide track, and centering means at the moulding station operative before complete closure of the mould to centre the unsupported end of the tubing length in the mould.
  • the centering means comprises a caliper device having a tapered lower end which enters the upper end portion of the tubing length and means for expanding said centering means symmetrically with respect to the mould cavity axis to centre said unsupported end of the tube length in the mould before complete closure thereof.
  • said centering means comprises a downwardly pointed caliper device formed with two arms which, during closing movement of the mould, enter the top end of the tube length and thereafter are expanded symmetrically with respect to the mould axis so that the arm extremities move in the plane of the parting line of the mold and engage the inside upper Wall of the tube length to centre said top end in the mould prior to complete closure thereof.
  • Apparatus for blow moulding hollow articles from discrete lengths of thermoplastic tubing comprising a plurality of groups of mandrels for supporting individual discrete lengths of thermoplastic tubing, a loading station including means for simultaneously loading each of said mandrels in one of said groups with a tubing length, an oven for heating att least one group of mandrel-supported tubing lengths to moulding temperature, a moulding station including mould means adapted to receive said group of lmandrel-supported tubing lengths at lmoulding temperatures, and means for simultaneously introducing fluid under pressure into tubing lengths of .said group at said moulding station to expand said tubing lengths into conformity with said mould means, an unloading and stripping station including means for simulttaneously removing moulded articles from said group of mandrels, conveyor means including ⁇ means for intermittently moving said mandrels in a closed noncircular path to advance each said group of mandrels successively from said unload
  • cen- .tering means comprise caliper devices mounted at spaced intervals along a horizontal vertically movable bar, each said caliper device comprising two arms pivoted at their upper ends to said bar, and means for translating downward movement of said bar into opening movement of said lcaliper means after entry of the lower end of said caliper means into said tubing length.
  • Apparatus for forming hollow articles from thermoplastic material comprising a plurality of groups of mandrels for supporting individual discrete lengths of thermoplastic tubing, a loading station including means for loading each of said mandrels in one of said groups with a tubing length, an oven for heating at least one group of mandrel-supported tubing lengths to moulding temperature, a moulding station including a plurality of mould means -composed of mould parts movable in synchronism towards and away from one another to close and open moulding cavities respectively, each such cavity having an internal contour corresponding to the external shape of said .article and being adapted to receive witih the other cavities a group of mandrel-supported tubing lengths at moulding temperature, means for simultaneously introducing fluid under pressure into said group of tubing lengths at said moulding station to expand said tubing lengths into conformity with the insides contour of said cavities, an unloading and stripping station for removing moulded articles from said group of mandrels, conveyor means including
  • centering means comprise half-kite shaped flat metal plates which taper downwardly to a point and are pivotally connected at their upper ends to a bar common to all of centering devices.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
US577682A 1965-10-01 1966-09-07 Blow molding apparatus Expired - Lifetime US3449792A (en)

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GB4167165 1965-10-01

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BE (1) BE687355A (enrdf_load_stackoverflow)
ES (1) ES331817A1 (enrdf_load_stackoverflow)
NL (1) NL6613799A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632262A (en) * 1969-09-12 1972-01-04 Phillips Petroleum Co Angled cutoff in bottom of blow mold
US3661489A (en) * 1970-07-07 1972-05-09 Beloit Corp Apparatus for forming containers by molding
US3957934A (en) * 1974-09-19 1976-05-18 Monsanto Company Forming molecularly oriented containers from preforms
US4050887A (en) * 1973-11-21 1977-09-27 Monsanto Company Method and apparatus for temperature conditioning parts
US5000905A (en) * 1988-07-21 1991-03-19 Cmb Packaging (Uk) Limited Stretch blow-moulding thermoplastics articles
US5587125A (en) * 1994-08-15 1996-12-24 Schneider (Usa) Inc. Non-coextrusion method of making multi-layer angioplasty balloons
US5876768A (en) * 1995-07-19 1999-03-02 Tetra Laval Holdings & Finance Sa Machines for the production of receptacles of plastic material
US5980229A (en) * 1995-12-07 1999-11-09 Tetra Laval Holdings & Finance Sa Heating device for machines for the transformation of plastic materials
US20060175935A1 (en) * 1996-09-30 2006-08-10 Bran Mario E Transducer assembly for megasonic processing of an article

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149373A (en) * 1960-09-13 1964-09-22 Marrick Mfg Co Ltd Production of hollow moulded articles
US3278665A (en) * 1963-01-03 1966-10-11 Phillips Petroleum Co Method for forming hollow plastic articles
US3283046A (en) * 1964-09-28 1966-11-01 Ethyl Corp Method for forming hollow articles
US3324507A (en) * 1960-01-12 1967-06-13 Esso Chemical Company Inc Apparatus for manufacturing hollow articles
US3339230A (en) * 1965-01-22 1967-09-05 John J Farrell Molding apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324507A (en) * 1960-01-12 1967-06-13 Esso Chemical Company Inc Apparatus for manufacturing hollow articles
US3149373A (en) * 1960-09-13 1964-09-22 Marrick Mfg Co Ltd Production of hollow moulded articles
US3278665A (en) * 1963-01-03 1966-10-11 Phillips Petroleum Co Method for forming hollow plastic articles
US3283046A (en) * 1964-09-28 1966-11-01 Ethyl Corp Method for forming hollow articles
US3339230A (en) * 1965-01-22 1967-09-05 John J Farrell Molding apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632262A (en) * 1969-09-12 1972-01-04 Phillips Petroleum Co Angled cutoff in bottom of blow mold
US3661489A (en) * 1970-07-07 1972-05-09 Beloit Corp Apparatus for forming containers by molding
US4050887A (en) * 1973-11-21 1977-09-27 Monsanto Company Method and apparatus for temperature conditioning parts
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NL6613799A (enrdf_load_stackoverflow) 1967-04-03
ES331817A1 (es) 1967-07-01
BE687355A (enrdf_load_stackoverflow) 1967-03-01

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